﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
//
using System.Configuration;

namespace DLLTest.OpertionClass
{
    class ConfigHelper
    {
        //http://developer.51cto.com/art/200908/146303.htm
        ///<summary>
        ///依据连接串名字connectionName返回数据连接字符串  
        ///</summary> 
        ///<param name="connectionName"></param>
        ///<returns></returns>
        private static string GetConnectionStringsConfig(string connectionName) 
        {  string connectionString = ConfigurationManager.ConnectionStrings[connectionName].ConnectionString.ToString();    
            Console.WriteLine(connectionString);
            return connectionString; 
        }
        ///<summary> 
        ///更新连接字符串  
        ///</summary>
        ///<param name="newName">连接字符串名称</param>
        ///<param name="newConString">连接字符串内容</param>
        ///<param name="newProviderName">数据提供程序名称</param>
        private static void UpdateConnectionStringsConfig(string newName,string newConString,string newProviderName)  
        { 
            bool isModified = false; 
            //记录该连接串是否已经存在    
            //如果要更改的连接串已经存在 
            if (ConfigurationManager.ConnectionStrings[newName] != null) 
            { 
                isModified = true;
            }
            //新建一个连接字符串实例   
            ConnectionStringSettings mySettings = new ConnectionStringSettings(newName, newConString, newProviderName);   
            // 打开可执行的配置文件*.exe.config
            Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None); 
            // 如果连接串已存在，首先删除它   
            if (isModified) 
            {
                config.ConnectionStrings.ConnectionStrings.Remove(newName); 
            }    
            // 将新的连接串添加到配置文件中.    
            config.ConnectionStrings.ConnectionStrings.Add(mySettings);
            // 保存对配置文件所作的更改    
            config.Save(ConfigurationSaveMode.Modified);
            // 强制重新载入配置文件的ConnectionStrings配置节  
            ConfigurationManager.RefreshSection("ConnectionStrings");
        }

        ///<summary> 
        ///返回＊.exe.config文件中appSettings配置节的value项  
        ///</summary> 
        ///<param name="strKey"></param> 
        ///<returns></returns> 
        private static string GetAppConfig(string strKey)  
        {
            foreach (string key in ConfigurationManager.AppSettings) 
            {
                if (key == strKey)
                {
                    return ConfigurationManager.AppSettings[strKey];  
                }
            }
            return null;
        }  
        ///<summary>  
        ///在＊.exe.config文件中appSettings配置节增加一对键、值对  
        ///</summary>  
        ///<param name="newKey"></param>  
        ///<param name="newValue"></param> 
        private static void UpdateAppConfig(string newKey, string newValue)  
        {
            bool isModified = false;  
            foreach (string key in ConfigurationManager.AppSettings)
            {
                if(key==newKey)
                { 
                    isModified = true; 
                }
            }
            // Open App.Config of executable    
            Configuration config =  ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
            // You need to remove the old settings object before you can replace it   
            if (isModified)
            {
                config.AppSettings.Settings.Remove(newKey);
            } 
            // Add an Application Setting. 
            config.AppSettings.Settings.Add(newKey,newValue); 
            // Save the changes in App.config file.    
            config.Save(ConfigurationSaveMode.Modified);   
            // Force a reload of a changed section. 
            ConfigurationManager.RefreshSection("appSettings"); 
        } 
        
        //
          /// <summary>
        /// 根据键值获取配置文件
        /// </summary>
        /// <param name="key">键值</param>
        /// <returns></returns>
        public static string GetConfig(string key)
        {
            string val = string.Empty;
            if (ConfigurationManager.AppSettings.AllKeys.Contains(key))
                val = ConfigurationManager.AppSettings[key];
            return val;
        }

        /// <summary>
        /// 获取所有配置文件
        /// </summary>
        /// <returns></returns>
        public static Dictionary<string, string> GetConfig()
        {
            Dictionary<string, string> dict = new Dictionary<string, string>();
            foreach (string key in ConfigurationManager.AppSettings.AllKeys)
                dict.Add(key, ConfigurationManager.AppSettings[key]);
            return dict;
        }

        /// <summary>
        /// 根据键值获取配置文件
        /// </summary>
        /// <param name="key">键值</param>
        /// <param name="defaultValue">默认值</param>
        /// <returns></returns>
        public static string GetConfig(string key, string defaultValue)
        {
            string val = defaultValue;
            if (ConfigurationManager.AppSettings.AllKeys.Contains(key))
                val = ConfigurationManager.AppSettings[key];
            if (val == null)
                val = defaultValue;
            return val;
        }

        /// <summary>
        /// 写配置文件,如果节点不存在则自动创建
        /// </summary>
        /// <param name="key">键值</param>
        /// <param name="value">值</param>
        /// <returns></returns>
        public static bool SetConfig(string key, string value)
        {
            try
            {
                Configuration conf = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
                if (!conf.AppSettings.Settings.AllKeys.Contains(key))
                    conf.AppSettings.Settings.Add(key, value);
                else
                    conf.AppSettings.Settings[key].Value = value;
                conf.Save();
                return true;
            }
            catch { return false; }
        }

        /// <summary>
        /// 写配置文件(用键值创建),如果节点不存在则自动创建
        /// </summary>
        /// <param name="dict">键值集合</param>
        /// <returns></returns>
        public static bool SetConfig(Dictionary<string, string> dict)
        {
            try
            {
                if (dict == null || dict.Count == 0)
                    return false;
                Configuration conf = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
                foreach (string key in dict.Keys)
                {
                    if (!conf.AppSettings.Settings.AllKeys.Contains(key))
                        conf.AppSettings.Settings.Add(key, dict[key]);
                    else
                        conf.AppSettings.Settings[key].Value = dict[key];
                }
                conf.Save();
                return true;
            }
            catch { return false; }
        }
    }
    
}
